# class Student(object):
#     def __init__(self,name,age):
#         self.name = name
#         self.age = age
#     __slots__ = ('name','age')
    

# s = Student('zhangsan',18)
# print('%s %s' % (s.name,s.age))

# s.score = 99
# print('%s %s %s' % (s.name,s.age,s.score))